Gasparyan retires in final, Kasatkina wins in St. Petersburg

<p>ST. PETERSBURG, Russia &mdash; Daria Kasatkina won the St. Petersburg Ladies Trophy on Sunday when wild card Margarita Gasparyan retired from their all-Russian final with a lower back injury.</p>
<p>The eighth-seeded Kasatkina was leading 6-3, 2-1 when Gasparyan’s back problems forced her to retire.</p>
<p>Kasatkina became the first player to win two WTA tournaments this year after winning in Melbourne, Australia last month. It’s her fourth title overall.</p>
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